update get connections thread to sleep 10ms per 1000 connectios. 0.9.181

@@ -840,9 +840,9 @@ void srs_update_rtmp_server(int nb_conn, SrsKbps* kbps)
             // there are maybe many many connections,
             // for example, when srs used for monitor other process,
             // like nginx, there are maybe many TIME_WAIT conections.
-            // we sleep 1ms when read 1000 records, so 100ms for 10w connections.
+            // we sleep 10ms when read 1000 records, so 1000ms for 10w connections.
             if ((i % 1000) == 0) {
-                st_usleep(1000);
+                st_usleep(10 * 1000);
             }
             
             if (ret == 1) {

@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR "0"
 #define VERSION_MINOR "9"
-#define VERSION_REVISION "180"
+#define VERSION_REVISION "181"
 #define RTMP_SIG_SRS_VERSION VERSION_MAJOR"."VERSION_MINOR"."VERSION_REVISION
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"